Traveling at airports this year is going to be hectic because 43.6 million passengers are expected to travel on United States carriers, up about 3 percent from last year, according to the Air Transport Association of America. Phone companies are making it easier for travelers by providing useful phone apps to download. Some of the phone apps are free and some cost 99 cents to 4.99. they have apps that help you navigate traffic, keep track of your flight, and find where you parked your car at the airport.